CA1132445A - Method for moulding cylindrical parts - Google Patents
Method for moulding cylindrical partsInfo
- Publication number
- CA1132445A CA1132445A CA352,690A CA352690A CA1132445A CA 1132445 A CA1132445 A CA 1132445A CA 352690 A CA352690 A CA 352690A CA 1132445 A CA1132445 A CA 1132445A
- Authority
- CA
- Canada
- Prior art keywords
- tube
- hand
- expandable
- split
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title 1
- 239000012530 fluid Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims 1
- 230000014759 maintenance of location Effects 0.000 claims 1
- 239000011347 resin Substances 0.000 abstract description 8
- 229920005989 resin Polymers 0.000 abstract description 8
- 239000013013 elastic material Substances 0.000 abstract description 2
- 239000004744 fabric Substances 0.000 abstract description 2
- 238000006116 polymerization reaction Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 101100421144 Danio rerio selenoo1 gene Proteins 0.000 description 1
- 241000283074 Equus asinus Species 0.000 description 1
- 101100202896 Mus musculus Selenoo gene Proteins 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002207 retinal effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/446—Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/0011—Moulds or cores; Details thereof or accessories therefor thin-walled moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/48—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling
- B29C33/50—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling elastic or flexible
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
- B29C43/12—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using bags surrounding the moulding material or using membranes contacting the moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Laminated Bodies (AREA)
Abstract
Selon l'invention, ce dispositif est caractérisé en ce qu'il comporte, d'une part, un tube en une matière rigide et élastique, fendu longitudinalement et ayant tendance à se dilater transversalement sous l'action de son élasticité propre et, d'autre part, des organes de maintien susceptibles, lorsqu'ils coopèrent avec ledit tube, d'obliger la cavité intérieure de celui-ci à prendre une section rétreinte correspondant à celle desdites pièces à mouler et, lorsqu'ils ne coopèrent pas avec ledit tube, de laisser ladite cavité intérieure prendre une section dilatée. Moulage de pièces tubulaires, notamment en stratifié de tissu souple imprégné de résine polymérisable.According to the invention, this device is characterized in that it comprises, on the one hand, a tube made of a rigid and elastic material, split longitudinally and tending to expand transversely under the action of its own elasticity and, d on the other hand, holding members capable, when they cooperate with said tube, of forcing the interior cavity of the latter to take a constricted section corresponding to that of said parts to be molded and, when they do not cooperate with said tube, to let said interior cavity take an expanded section. Molding of tubular parts, in particular in laminate of flexible fabric impregnated with polymerizable resin.
Description
T,a présente invention concerne le moulage de pièces cylindriques.
Par "pièce cylindrique" on entend ci-après tou-te pièce dont la surface exterieure est formée de genératrices parallèles, quelle que soit la forme de sa section qui, bien entendu, peut être circulaire, mais peut egalement être ovale, polygonale, etc....
On sait que la realisation de pièces cylindriques par moulage soulève des difficultes,puisque leur forme les rend pratialuement indémoulables. Pour realiser de telles pièces, on ne peut utiliser des moules monoblocs et on est oblige de prevoir des moules en 10 au moins deux parties assemblables selon un plan de joint passant par l'axe desdites pièces. Outre le fait que de tels moules sont co~teux, leur mise en oeuvre au demoulage necessite generalement l'arrachage d'une des parties du moule par rapport à l'autre, ce qui est prejudiciable à la duree de vie des surfac-es du plan de 15~ joint et des organes de positionnement relatif desdites parties.
Si l'on veut,pour eviter ces inconvenients, utiliser des moules monoblocs moins couteux et d'usage plus long que les moules en plusieurs parties, on est oblige de donner de la depouille auxdites pieces, c'est-à-dire de les rendre legerement coniques. Une telle 20 deformation n'est pas toujours possible, lorsque lesdites pieces doivent être absolument cylindriques.
La presente invention a pour objet de remedier a ces inconvénients~
~lle concerne un dispositif de moulage mo~obloc, peu coûteux, permettant le moulage et le demoulage aises de pièces parfaitement 25 cylindriques. De plus, ce dispositif selon l'invention communique aux pièces cylindriques moulees, directement de moulage, un etat de surface de haute finition.
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cette fin, selon l'invention, le dispositif pour le moulage de pieces cylindriques est remarquable en ce qulil comporte, d'une 30 part, un tube en une matière rigide et elastique, fendu longitu-clinalement et ayant tendance a se dilater transversalement sous l'action de son élasticité propre et, d'autre part, des or~anes de maintien susceptibles,lorsqu'ils coopèrent avec ledit -tube , d'obliger la cavité interieure de celui-ci ~ prendre une section 35 retreinte correspondant à ce]le desdites piec~s à mouler e-t, lorsq~'ils ne c~op~rent pas avec ledit tube, de laisser ladite ité interieure prendre une sec~ion dilatee.
Ainsi, pendant le moulage, lesdits organes de maintien perm~tte au tube de const.ituer le moule, tandis q~le, pour démouler une piece cylindrique qui vient d'etre moulée, il suffit d'élin,irler l'acti.on desdits organes de maintien, de sorte que ledit tu}:)e se dilate eL que ladite pièce peut facilement etre s~rtie dU t.ul)e.
Tout se p~sse comme si le moule monobloc selon l'invel,~ion eLcli~
const::itoé de deux coquilles hémicylindriques articulél~ le long d'une ~énératrice diamétralement opposée à la fente longitu~linale Au tube, pour pouvoir pivoter l'une par rapport à l'autre de .façon limitee, le passage de la position rétrein~e 3 la position d.ilatée s'e~fectuant sous l'action de l'élasticite propre du tube, t~lldis que le passage de la position dilatée a la position rétreinte s'effectue à l'encontre de cette ac~ion elastique.
De préferellce, le tube transversalement expansible du dispositif selon l'invention est en acier et il est traite interieurement de açon m~canique, par exemple par galetage, afin d'y créer une contrainte susceptible de permettre audit tube de se dilater transversal.ement lorsqu'il est fendu. Un tel traitement mécani.que présente l'avantage de conferer à l'intérieur du tube, qui consti-tuera la cavite de moulage, un excellent etat de surfa(e et une gral--de resistance à l'usure pa~ frottementO Ainsi, le moule obtenu est solide et confère aux pieces moulées un bon fini.
Par exenll~le, dans le cas de tubes d'acier ~le la qualite des cylindre~ de verins hydrauliques, ayant un diamètre ir~terieur nominal de 60 mm, on peut obtenir, par galetage, une auglnentation spontan~e de 0,5 à 1 mm de ce diametre interieur, dès que le tube est fendu. La largeur de la ~ente peu~ être faible, par exemple de l'ordre du demi-millimètre.
Dans ces conditions, il suffit de prevoir des moyens de serrage combinés avec les organes de maintien ou independants de ceux-ci, t:els que brides ou colliers, permettant le passage du tube de sa sec-tion dilatée à sa section rétreinte et inversement, pour que le tube prenne sa forme de moulage ou celle de démoula~e.l.es operations de serrage et de desserrage du -tube etant effectuees bien en le~à de la limite elastique, elles peuvent être renou-.
~ 5 velé~ de très nombreuses f~is sans déterioration du tube.
Le dispositif sel-or, l'invention peut être utilisé pour le moulage de pièces cylindriques pleines ou tubulaires eh une mati~re peu fluide, n~ayant pas ou que peu tendance ~ s'échapper par la f~nte longitudinale du tube. Dans le cas du moulage d'une piëce tubulaire , il est nécessaire de prévoix un noyau intérieur audit tube expansible et maintenu dans une position relative déterminée par rapport à celui-ci.
Cependant, le dispositif selon l'invention est particulièrement ~pproprié à la réalisation de pièces tubulaires constituées d'un stratifie de tissu souple imprégné d'une r~sine polymerisable. Dans ce cas, le noyau interieur peut servir de mandrin d'enroulement et/ou de support audit stratifie et il est avantageux que ledit noyau soit lui-même prevu radialement expansible pour presser ledit stratifie contre la paroi interieure du tube fendu pendant la polymerisation de ladite resine.
Un tel noyau peut comporter une vessie gonflable reliee a l'exte-rieur du tube fendu à une source de fluide sous pression. ~adite vessie gonflable peut etre montée sur un tube rigide lui servant de support, l'intérieur dudit tube étant en communication d'une part avec ladite source de fluide sous pression et d'autre part~
par l'intermediaire de trous traversants, avec La face interne de ladite vessie.
Les rigures du dessin annexé feront bien~comprendre comment l'invention peut être realisee.
La figure 1 est une vue, partie:Llement en coupe longitudinale, d'un dispositif de moulage selon l'invention, destiné a 1a réàlisation de corps de bielle tubulaire.
. .
La figure 2 est une vue en coupe transversale selon la ligne II-II
de la figure 1.
La figùre 3 est une vue exterieure du tube fendu du dispositif des figures 1 et 2.
. .
L~ fig~lr~ 4 es~ ~nc vuc en couE>e longitudinale du noyau int~xieur d~ disp~sitif de la figure 1.
Le dispositif de moulage selon l'invention, montre par les figures 1 et 2, est destine ~ la realisation de corps de bielles t~bulaires en stratifie t.issu-resine polymerisable. Il comporte un tube d'acier 1, ayant subi un galetage interieur et comportant une fente longitudinale 2. Du fait du galetage interieur, le tube 1 est soumi.s à une contrai.nte mecanique tendant à le faire se dil.ater élastiquement, de façon limitée.
10 I.a clilatation radiale du tube 1 est contrôlée par au moins un collier élastique de serrage 3, entourant ledit tube et pourvu d'une vis de reglage 4 (voir la figure 2).
Grâce au collier de serrage 3, il est possible d'amener le tube 1 ~ son diamètre nominal et alors de le fermer par deux embouts IS d'e~trëmite 5 et 6, solidarises dudit tube par la force d'expansion cle celui-ci.
l'intérieur du tube 1 peut etre maintenu,par une entretoise 7, un noyau coaxial expansi~le 8.
Ce noyau 8 comporte un tube rigi.de 9, obturé à ses extr~mités par des bouchons 10 et 11 et supportant une vessie gonflable 12.
L'intérieur du tube rigide.9 peut être relié a une source de fluide sous pression (non representée) par l'intermédiaire d'un connecteur 13, solidaire cle l'embout 11 et traversant l'embout ~). Par ailleurs, l'intérieur dlu tube rigide 9 est en communication avec la paroi interne de la vessie 12 par l'intermédiaire de trous traversants 14.
Pour effectuer un corps tub~laire en stratifie tissu-resi~e~
on opère de la façon suivante~
Sur le noyau 8 de la figure 4, supposé sorti du tube 1, on enroule le stratifié souple (non représenté). Ensuite, le noyau 8 et l'enroulement de stratifie~ qu'il porte sont mis en place dans le tube 1 qui se ~rouve en position dilatée, du fait que le ou les colliers 3 sont desse~res~ Lors de cette mise en place, on .~ ~
'ispose l'entretoise 7 et le stratifie prend la place de l'espace 15 prévu en~re le noyau 8 et le tube 1. Le ou les colliers 3 sont alors serres jusqu ' a amener le tube 1 à sa position nominale retreinte. On peut donc le fermer par les embouts 5 ~t 6 qui sont maintenus solidarises du fait qu'on desserre un peu les colliers 3 de sorte que la pression radiale d'expansion des extremites du tube 1 s'exerce sur lesdits embouts.
I.e dispositif de moulage de la figure 1 est introduit dans un four par exemple à 120C pendant une heure et demie et le connecteur 10 13 est relie à une source d'air ~omprime. Ainsi, l'enroulement de stratifié est plaque contre l'interleur du tube 1 par la vessie 12 ~ui se dilate sous l'action de l'air sous pression et la résine impregnant le stratifié se polymérise.
La resine excedentaire est chassée par la fente 2 du tube 1. Après 15 polymerisation de la resine~, le dispositif est déconnecté de la source~ d'air comprime et retire du four.
Après une periode de refroidissement, par exemple de 30 minutes à temperature ambiante, les embouts 5 et 6 sont demonts, ainsi que les colliers 3 qui maintenaient le tube 1 à son diamètre 20 nominal. Sous l'action de ses contraintes internes, le tube 1 augmente legèrement de diamètre et se decolle automatiquementde la pièce moulee. ~
La vessie dégonflee 12 revient c`l son diam~re normal et le noyau 8 portant la pièce moulee est retiree du tube 1 La pièce moulee 25 est ensuite extraite du noyau ~récedent par coulissement.
Un léger ponçage est alors effectue sur la pièce afin de supprimer les écoulements de resine produits pendant la polymérisation dans la fente 2.
L'absence de matrice à llextérieur de la pièce moulée au moment 30 du demoulage de celle-ci par rapport à la vessie facilite grandement la récuperation de ladite vessie~ la piece moulee ne subissant aucune contrainte exterieure.
L'invention permet notamment de realiser des corps de bielles ~ 2 ~
structurales pour a~ronefs gros por~eurs, avec une précision d'execution et un fini remarquables. De plus, l'outillage selo~
l'invention est peu coûteux et très robuste. Il permet d'obtenir des tubes de ~ifferentes ~paisseurs pour un diamètre ext~rieur constant. T, a present invention relates to the molding of cylindrical parts.
By "cylindrical part" is meant hereinafter all part whose outer surface is formed by parallel generators, which that is the shape of its section which, of course, can be circular, but can also be oval, polygonal, etc.
We know that the production of cylindrical parts by molding raises difficulties, since their shape makes them practically unbreakable. To make such pieces, you cannot use monoblock molds and we have to provide molds in 10 at least two parts which can be assembled according to a passing joint plane by the axis of said parts. Besides the fact that such molds are costly, their use in demolding generally requires the uprooting of one part of the mold relative to the other, this which is detrimental to the lifespan of plan surfaces 15 ~ joint and relative positioning members of said parts.
If you want to avoid these disadvantages, use molds monoblocks less expensive and longer to use than molds several parts, we are obliged to give skin to said pieces, that is to say to make them slightly conical. Such a 20 deformation is not always possible, when said pieces must be absolutely cylindrical.
The object of the present invention is to remedy these drawbacks ~
~ It relates to a molding device ~ obloc, inexpensive, allowing easy molding and unmolding of parts 25 cylindrical. In addition, this device according to the invention communicates to molded cylindrical parts, directly from molding, a state of high finish surface.
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to this end, according to the invention, the device for molding of cylindrical parts is remarkable in that it comprises, of a 30 part, a tube in a rigid and elastic material, split longitu-clinically and tending to expand transversely under the action of its own elasticity and, on the other hand, gold ~ donkeys holding likely, when they cooperate with said tube, to force the interior cavity of it ~ take a section 35 shrink corresponding to this] said piec ~ s to mold and, when they do not operate with said tube, to leave said ity interior take a sec ~ ion dilated.
Thus, during molding, said perm ~ tte holding members to the tube of const.ituer the mold, while q ~ the, to demold a cylindrical part which has just been molded, it suffices to elinate, irler the acti.on of said holding members, so that said tu} :) e expands eL that said piece can easily be s ~ rtie dU t.ul) e.
Everything p ~ sse as if the one-piece mold according to the invel, ~ ion eLcli ~
const :: itoé of two articulated semi-cylindrical shells ~ along of a ~ enerator diametrically opposite to the longitu ~ linear slot To the tube, to be able to pivot one relative to the other by limited way, the passage from the retinal position ~ e 3 the position d.ilatée e e fectuant under the action of the own elasticity of the tube, t ~ lldis that the transition from the expanded position to the position constriction is carried out against this elastic ac ~ ion.
Preferably, the transversely expandable tube of the device according to the invention is made of steel and it is treated internally of ace m ~ canique, for example by burnishing, in order to create a stress likely to allow said tube to expand transversely when split. Such mechanical processing has the advantage of conferring inside the tube, which constitutes will kill the molding cavity, excellent surface condition and a great--wear resistance pa ~ frictionO Thus, the mold obtained is solid and gives the molded parts a good finish.
For example, in the case of steel tubes, the quality of cylinder ~ of hydraulic cylinders, having a diameter ir ~ terieur nominal 60 mm, an increase can be obtained by roller burnishing spontan ~ e from 0.5 to 1 mm of this internal diameter, as soon as the tube is split. The width of the ~ little ente ~ be small, for example of the order of half a millimeter.
In these conditions, it suffices to provide clamping means combined with holding bodies or independent of them, t: such as flanges or collars, allowing the passage of the tube its dilated section to its constricted section and vice versa, so that the tube takes its form of molding or that of demoulded ~ eles tightening and loosening of the tube being carried out well in the ~ at the elastic limit, they can be renewed .
~ 5 velé ~ many f ~ is without deterioration of the tube.
The salt-gold device, the invention can be used for molding of solid cylindrical or tubular parts in a little material fluid, having no or little tendency to escape through the f ~ nte longitudinal of the tube. In the case of molding a part tubular, it is necessary to provide an inner core for said expandable tube and maintained in a determined relative position compared to this one.
However, the device according to the invention is particularly ~ Suitable for the production of tubular parts consisting of laminate of flexible fabric impregnated with a polymerizable resin. In in this case, the inner core can serve as a winding mandrel and / or support for said laminate and it is advantageous that said core itself provided radially expandable to press said laminate against the inner wall of the split tube for polymerization of said resin.
Such a core may include an inflatable bladder connected to the outside of the split tube to a source of pressurized fluid. ~ adite inflatable bladder can be mounted on a rigid tube serving it support, the interior of said tube being in communication with a part with said source of pressurized fluid and secondly ~
through through holes, with the internal face of said bladder.
The rigures of the attached drawing will make it clear ~ understand how the invention can be realized.
Figure 1 is a view, part: Llement in longitudinal section, of a molding device according to the invention, intended for 1a realization of tubular connecting rod body.
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Figure 2 is a cross-sectional view along line II-II
of figure 1.
Figùre 3 is an external view of the split tube of the device Figures 1 and 2.
. .
L ~ fig ~ lr ~ 4 es ~ ~ nc vuc en couE> e longitudinal du core int ~ xieur d ~ disp ~ sitif of Figure 1.
The molding device according to the invention, shown by the Figures 1 and 2, is intended ~ the realization of rod bodies t ~ bulars in polymerizable t.issu-resin laminate. It comprises a steel tube 1, having undergone an internal roller burnishing and comprising a longitudinal slot 2. Due to the internal roller burnishing, the tube 1 is subject to a mechanical constraint tending to do so elastically dilate, to a limited extent.
10 the radial expansion of the tube 1 is controlled by at least one elastic clamp 3, surrounding said tube and provided an adjustment screw 4 (see Figure 2).
Thanks to the clamp 3, it is possible to bring the tube 1 ~ its nominal diameter and then close it with two end caps IS of e ~ hopper 5 and 6, joined to said tube by the force of expansion key this one.
the inside of the tube 1 can be maintained, by a spacer 7, an expanding coaxial nucleus ~ le 8.
This core 8 comprises a rigi.de tube 9, closed at its extremities by plugs 10 and 11 and supporting an inflatable bladder 12.
The interior of the rigid tube. 9 can be connected to a source of pressurized fluid (not shown) through a connector 13, integral with the end piece 11 and passing through the end piece ~). Furthermore, the interior of the rigid tube 9 is in communication with the internal wall of the bladder 12 via holes through 14.
To make a tub body ~ laminate fabric-resi ~ e ~
we operate as follows ~
On the core 8 of FIG. 4, assumed to have left the tube 1, we rolls up the flexible laminate (not shown). Then the kernel 8 and the laminate winding it carries are put in place the tube 1 which is reopened in the expanded position, because the or the collars 3 are desse ~ res ~ During this installation, we . ~ ~
is the spacer 7 and the laminate takes the place of space 15 provided in ~ re the core 8 and the tube 1. The collar (s) 3 are then tighten until the tube 1 is brought to its nominal position shrunk. It can therefore be closed by the end pieces 5 ~ t 6 which are held together because we loosen the necklaces a little 3 so that the radial pressure of expansion of the ends of the tube 1 is exerted on said tips.
Ie molding device of Figure 1 is introduced into an oven for example at 120C for an hour and a half and the connector 10 13 is connected to a source of air ~ omprime. So the winding of laminate is plate against the tube interleur 1 by the bladder 12 ~ which expands under the action of pressurized air and resin permeating the laminate polymerizes.
The excess resin is expelled through the slot 2 of the tube 1. After 15 resin polymerization ~, the device is disconnected from the source of air compresses and removes from the oven.
After a cooling period, for example 30 minutes at room temperature, the nozzles 5 and 6 are removed, thus as the collars 3 which held the tube 1 at its diameter 20 nominal. Under the action of its internal constraints, the tube 1 slightly increases in diameter and automatically detaches from the molded part. ~
The deflated bladder 12 returns to its normal diameter and the core 8 carrying the molded part is removed from the tube 1 The molded part 25 is then extracted from the core ~ recedent by sliding.
A light sanding is then carried out on the part in order to remove resin flows produced during polymerization in slot 2.
The absence of a matrix inside the molded part at the time 30 of the demolding thereof relative to the bladder facilitates greatly recovery of said bladder ~ the molded part does under no external constraint.
The invention makes it possible in particular to produce rod bodies ~ 2 ~
structural for large aircraft, with precision remarkable execution and finish. In addition, selo tools ~
the invention is inexpensive and very robust. It provides tubes of ~ different thicknesses for an outside diameter constant.
Claims (5)
EXCLUSIVE DE PROPRIETE OU DE PRIVILEGE EST REVENDIQUE, SONT DEFINIES
COMME IL SUIT: THE ACHIEVEMENTS OF THE INVENTION, ABOUT WHICH A RIGHT
EXCLUSIVE OF PROPERTY OR PRIVILEGE IS CLAIMED, ARE DEFINED
AS FOLLOWS:
en ce que ledit tube est en acier et est traité intérieurement de façon mécanique avant d'être fendu, afin d'y créer des contraintes susceptibles de permettre audit tube de se dilater transversalement de façon spontanée, lorsqu'il est fendu. 1. Device for molding tubular parts made of a laminate of fibers impregnated with poly-merisable, comprising, on the one hand, a longitudinal outer tube slowly split into a deformable material, the inner wall of which is intended to define the outer wall of said tubular parts which are associated with likely clamping members, when they cooperate with said tube, to maintain the cavity lower of it to a restricted section correspond to that parts to be molded and, when they do not cooperate with said tube, allowing said interior cavity to take a section enlarged, and, on the other hand, an expandable inner core, serving to define the inner wall of said tubular parts, characterized in that said tube is made of steel and is treated internally with mechanically before being split, in order to create constraints likely to allow said tube to expand transversely spontaneously, when split.
en ce qu'il comporte des organes de maintien, combinés avec les organes de serrage ou indépendants de ceux-ci, permettant le maintien de tube à sa section rétreinte. 2. Device according to claim 1, characterized in that it comprises holding members, combined with the clamping members or independent thereof, allowing the tube retention at its constricted section.
en ce que lesdits organes de maintien sont constitués par des embouts amovibles, aptes à emprisonner les extrémités du tube trans-versalement expansible. 4. Device according to claim 2, characterized in that said holding members are constituted by removable tips, able to trap the ends of the trans-versally expandable.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7913314 | 1979-05-25 | ||
FR7913314A FR2457173A1 (en) | 1979-05-25 | 1979-05-25 | DEVICE FOR MOLDING CYLINDRICAL PARTS |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1132445A true CA1132445A (en) | 1982-09-28 |
Family
ID=9225857
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA352,690A Expired CA1132445A (en) | 1979-05-25 | 1980-05-26 | Method for moulding cylindrical parts |
Country Status (8)
Country | Link |
---|---|
US (1) | US4350485A (en) |
EP (1) | EP0020248B1 (en) |
JP (1) | JPS55158938A (en) |
BR (1) | BR8003281A (en) |
CA (1) | CA1132445A (en) |
DE (1) | DE3066743D1 (en) |
ES (1) | ES251300Y (en) |
FR (1) | FR2457173A1 (en) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6213327A (en) * | 1985-07-10 | 1987-01-22 | Kubota Ltd | Manufacture of resin pipe |
US4876049A (en) * | 1985-11-21 | 1989-10-24 | Nippon Petrochemicals Co., Ltd. | Method for preparing molded articles of ultra-high molecular weight polyethylene |
CA1311595C (en) * | 1987-10-09 | 1992-12-22 | David R. Nelson | Process and equipment for making composite tubes |
US5071506A (en) * | 1987-10-09 | 1991-12-10 | Thiokol Corporation | Equipment for making composite tubes including an inflatable heated bladder and a composite mold having a negative coefficient of thermal expansion |
DE3923416A1 (en) * | 1989-07-12 | 1991-01-24 | Mecron Med Prod Gmbh | METHOD FOR PRODUCING A BODY HAVING A HOLLOW PROFILE |
FR2670155B1 (en) * | 1990-12-05 | 1994-11-04 | Salomon Sa | PROCESS FOR PRODUCING TUBULAR OBJECTS MADE OF COMPOSITE MATERIALS. |
US6692681B1 (en) | 1997-01-29 | 2004-02-17 | Raytheon Aircraft Company | Method and apparatus for manufacturing composite structures |
AU6137798A (en) * | 1997-01-29 | 1998-08-18 | Raytheon Aircraft Company | Method and apparatus for manufacturing composite structures |
DE19835361A1 (en) * | 1998-08-05 | 2000-02-10 | Abb Patent Gmbh | Method and device for impregnating conductor bars for the stator winding of an electrical machine |
FR2795016B1 (en) | 1999-06-15 | 2001-09-14 | Oreal | MOLD FOR THE MANUFACTURE OF A STICK |
JP4251900B2 (en) * | 2003-03-28 | 2009-04-08 | 藤倉ゴム工業株式会社 | Internal pressure molding method and apparatus for hollow FRP molded product |
NL1025960C2 (en) * | 2004-04-16 | 2005-10-18 | Spectralyte Res & Dev B V | Method and device for manufacturing a product from composite material. |
US20060054758A1 (en) * | 2004-09-16 | 2006-03-16 | Simpson Allen H | Fixture for holding a preform during a heating process |
DE102008023629A1 (en) * | 2008-05-15 | 2009-11-19 | Mt Aerospace Ag | Integral hollow component made of fiber composite plastic |
US20100186899A1 (en) * | 2009-01-15 | 2010-07-29 | Airtech International, Inc. | Thermoplastic mandrels for composite fabrication |
EP2427312A2 (en) * | 2009-05-04 | 2012-03-14 | Mag Ias Llc. | Method and apparatus for rapid molding of wind turbine blades |
DE102010046570A1 (en) * | 2010-09-27 | 2012-03-29 | Claas Fertigungstechnik Gmbh | Laying machine and method for manufacturing a composite workpiece |
US9448045B2 (en) | 2010-11-16 | 2016-09-20 | Aldila Golf Corp. | High straightness arrow and method of manufacture |
WO2012074546A2 (en) * | 2010-11-16 | 2012-06-07 | Aldila Golf Corporation | High straightness arrow and method of manufacture |
US10161727B2 (en) | 2010-11-16 | 2018-12-25 | Aldila Golf Corporation | High straightness arrow and method of manufacture |
US9862137B2 (en) | 2015-04-20 | 2018-01-09 | Milwaukee Electric Tool Corporation | PEX expanding tool |
CN112297409B (en) * | 2015-06-10 | 2022-09-30 | 米沃奇电动工具公司 | PEX expanding tool |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR737944A (en) * | 1931-09-25 | 1932-12-19 | Les Fils De Peugeot Freres | Device intended to blind leaks in water pipes |
US2404966A (en) * | 1944-09-14 | 1946-07-30 | Richard J Kingston | Tile forming mold |
FR1127465A (en) * | 1955-05-27 | 1956-12-17 | Auxicom | Rotary mold for pipe fabrication and other applications |
US2869213A (en) * | 1955-12-02 | 1959-01-20 | Cretex Co Inc | Gasket sealed concrete pipe form |
US3110074A (en) * | 1960-05-03 | 1963-11-12 | Menzel Martin | Apparatus for the production of masts, tubes, columns and the like |
US3177105A (en) * | 1960-10-17 | 1965-04-06 | Structural Fibers | Method of making fiber-reinforced hollow article |
DE1143012B (en) * | 1960-11-18 | 1963-01-31 | Strahinja Pavicevic | Mold for the production of pipes from plastic reinforced with fiberglass fabric |
FR1297312A (en) * | 1961-05-19 | 1962-06-29 | Studebaker Packard Corp | Prestressed hollow articles, process and machine for their manufacture |
GB958467A (en) * | 1961-11-14 | 1964-05-21 | Strahinja Pavicevic | Improvements in the manufacture of plastic tubes and the like |
US3257690A (en) * | 1963-02-14 | 1966-06-28 | Babbitt Pipe Company Inc | Mandrel |
US3454257A (en) * | 1966-08-25 | 1969-07-08 | Robert C Dupuis | Concrete testing mold |
US3377657A (en) * | 1967-03-31 | 1968-04-16 | Youngstown Sheet And Tube Co | Apparatus for molding a reinforced hollow plastic article |
AU417025B2 (en) * | 1967-04-10 | 1971-09-13 | Vulcan Australia Limited | Method and apparatus for enveloping elongated articles within an impermeable covering |
US3679167A (en) * | 1970-06-09 | 1972-07-25 | Bernard Jupiter | Device for forming hamburger patties |
DE2232727A1 (en) * | 1972-07-04 | 1974-01-24 | Continental Gummi Werke Ag | Variable diameter mould - esp for coating roller cores with a plastic outer case |
GB1453936A (en) * | 1973-10-19 | 1976-10-27 | Mcdonald R H Russell H E | Method of moulding reinforced plastic materials |
US3989221A (en) * | 1974-12-09 | 1976-11-02 | Nippon Concrete Kogyo Kabushiki Kaisha | Form structure for use in the making of columnar or the like concrete products |
DE2631374A1 (en) * | 1976-07-13 | 1978-01-26 | Bosch Gmbh Robert | PROCESS FOR MANUFACTURING HOLLOW BODIES FROM COMPOSITE MATERIALS |
US4084782A (en) * | 1976-12-27 | 1978-04-18 | Nippon Concrete Kogyo Kabushiki Kaisha | Split mould for making tapered concrete poles |
-
1979
- 1979-05-25 FR FR7913314A patent/FR2457173A1/en active Granted
-
1980
- 1980-05-14 JP JP6386780A patent/JPS55158938A/en active Granted
- 1980-05-22 EP EP80400718A patent/EP0020248B1/en not_active Expired
- 1980-05-22 DE DE8080400718T patent/DE3066743D1/en not_active Expired
- 1980-05-23 ES ES1980251300U patent/ES251300Y/en not_active Expired
- 1980-05-23 BR BR8003281A patent/BR8003281A/en not_active IP Right Cessation
- 1980-05-26 CA CA352,690A patent/CA1132445A/en not_active Expired
-
1981
- 1981-08-31 US US06/297,755 patent/US4350485A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
BR8003281A (en) | 1980-12-30 |
ES251300Y (en) | 1981-03-16 |
US4350485A (en) | 1982-09-21 |
FR2457173B1 (en) | 1983-07-29 |
ES251300U (en) | 1980-10-01 |
JPS6317611B2 (en) | 1988-04-14 |
EP0020248A1 (en) | 1980-12-10 |
FR2457173A1 (en) | 1980-12-19 |
JPS55158938A (en) | 1980-12-10 |
EP0020248B1 (en) | 1984-02-29 |
DE3066743D1 (en) | 1984-04-05 |
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